20-mm-Diameter Interferometric Hydrophone Towed Array Based on Fiber Bragg Gratings

Zhen, 郭振 Guo; Kan, 高侃 Gao; Hui, 杨辉 Yang; Zhiguo, 代志国 Dai; Bingyan, 吴昺炎 Wu; Jun, 张军 Zhang

doi:10.3788/aos201939.1106003

Cited by 10 publications

(3 citation statements)

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“…It is good performance in sensitivity and frequency response, with mandrel structure of the hydrophone unit. However, it's hard to reduce the array size [3][4] . The coating sensitization of hydrophone have testified to be feasible but the mechanical strength of this structure is poor and can not achieve stable towing [5][6][7] .…”

Section: Introductionmentioning

confidence: 99%

Ultra-fine cable fiber optic hydrophone array for acoustic detection

Wu,

Huang,

et al. 2023

Eighteenth National Conference on Laser Technology and Optoelectronics

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We demonstrate an ultra-fine fiber optic hydrophone array for acoustic detection. It is consisted of Weak Reflection Fiber Bragg Grating (WFBG), including four layers: optical fiber layer, coating layer, tensile layer, and sealing layer. Moreover, an hydroacoustic detection system which based on matched interference is established. The responses of underwater acoustic signals, generated by vibration liquid column, in the areas of amplitude, phase and frequency were demodulated simultaneously using the combining algorithm of digital arc tangent and PGC algorithm. A relative flatness response of 3dB was achieved in the frequency range from 200 to 2000 Hz. And the experiments showed that acoustic pressure sensitivity is about -147.96 dB (re 1rad/μPa).

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Section: Introductionmentioning

confidence: 99%

Ultra-fine cable fiber optic hydrophone array for acoustic detection

Wu,

Huang,

et al. 2023

Eighteenth National Conference on Laser Technology and Optoelectronics

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“…The number of devices in the existing all-fiber towed linear array is large, which makes the volume of the all-fiber towed linear array larger and limits the diameter of the towed array [5][6] . At present, for the ultra-fine towed linear array without attitude sensor, only the shape of the tow cable is estimated [7] . Odom J L [8] et al propose to combine the two estimations using adaptive weights to obtain improved shape estimation during maneuvering; Yue-Hui T [9] et al proposed a method to a shape deformation estimation method for towed array sonar has been proposed based on parabolic model and exponential model; Maofa W [10] et al pointed out that a motion model of the towed linear array under an ISW according to the Korteweg-De Vries (KdV) equation and solve the model by finite method combined with the Newton iteration method.…”

Section: Introductionmentioning

confidence: 99%

All-fiber acoustic-posture integrated towed linear array based on fiber laser hydrophone

Zhao,

Yang,

Zhao

et al. 2023

AOPC 2023: Optic Fiber Gyro

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The impact of attitude deformation of towed linear array and the fitting error of point attitude sensors on beamforming. We studied All-fiber acoustic-posture integrated towed linear array based on distributed feedback fiber laser (DFB-FL) hydrophone and optical frequency domain reflectometry (OFDR) distributed attitude measurement. Analyzed the principle of towed array direction finding, and the influence of towed array attitude deformation on directional error was analyzed. Designed an 8-element hydrophone towed linear array structure with a diameter of 16mm, effectively combining fiber laser hydrophones with attitude sensing multi-core optical fiber. Finally, the effectiveness of attitude correction was verified through static direction finding experiments in anechoic tank, and the accuracy of direction finding was better than 2° under the extreme "S-bend" shape conditions of the drag array attitude. It can effectively improve the accuracy of direction finding.

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“…10 Guo made a 32-element fiber grating interferometric towed hydrophone array with an outer diameter of 20 mm, whose acoustic pressure phase sensitivity is about −143.9 dB (re rad/μPa). 11 However, in recent years, the achieved diameter of FBG hydrophone towed linear arrays has been less than 20 mm in China.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin interferometric hydrophone towed line array based on uwFBG

Wu,

Gu,

Pang

et al. 2023

AIP Advances

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In order to improve the suitability of the fiber hydrophone towing line array, we propose an interferometric hydrophone towed line array with a diameter of 1.7 mm. The line array is an integration of sensitization and package, embedding grating sensors in the composite materials of Kevlar and polyurethane in an additional pultrusion process. The theory and experiment indicate that polymer cladding of pultrusion is an effective way to improve phase sensitivity, increasing mechanical strength and decreasing cable diameter simultaneously. Then, a hydroacoustic detection system, with a quasi-distributed ultra-weak fiber Bragg grating towed line array, based on unbalanced interference is established and its phase sensitivities are tested experimentally. The result is measured by the vibration liquid column method and compared with a standard piezoelectric underwater acoustic detector. Over the frequency range of 200–2000 Hz, the system has a good amplitude–frequency response. We obtain an average phase sound pressure sensitivity of about −147.96 dB (re 1 rad/μPa) and a relative flatness response of 3 dB. The experimental results show that this system provides the possibility of an integrated hydrophone towed linear array with high adaptability and reliability.

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20-mm-Diameter Interferometric Hydrophone Towed Array Based on Fiber Bragg Gratings

Cited by 10 publications

References 0 publications

Ultra-fine cable fiber optic hydrophone array for acoustic detection

Ultra-fine cable fiber optic hydrophone array for acoustic detection

All-fiber acoustic-posture integrated towed linear array based on fiber laser hydrophone

Ultrathin interferometric hydrophone towed line array based on uwFBG

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